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It really speeds up the process if you let it dry in the sun after applying. I usually do two coats (three if it's a new top...).

I do it in the sun also, works great. Usually three coats, but I've only done it once, beginning of last summer. Have not washed the top since. Stiff brushing is all it gets and the top looks brand new. Beads up beautifully in the rain.